Scientific data near [39.70000,-76.18000]

Search area extends approximately 2.2 km east-west and 2.9 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Cecil	county
Maryland	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Conowingo Dam	quadrangle 1:24,000 scale
York	quadrangle 1:100,000 scale
Baltimore	quadrangle 1:250,000 scale
Watershed boundaries (USGS hydrologic units)
Lower Susquehanna	hydrologic unit
Lower Susquehanna	hydrologic accounting unit
Susquehanna	hydrologic subregion
Mid Atlantic	hydrologic region

Geology of US states

Digital geologic maps of the US states with consistent lithology, age, GIS database structure, and format

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Unit	State	Lithology
Baltimore Gabbro Complex	MD	Late Precambrian (?) - Early Paleozoic
Ultramafic Rocks	MD	Early Paleozoic - Late Precambrian (?)

Airborne geophysical surveys

Aerial surveys of magnetic anomaly and gamma ray emission; older surveys were analog record which have been digitized, newer surveys collected data in digital form.

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ID	Data type	Description
Maryland Coop '68	M-Dz	Maryland Coop '68 3947 line km with spacing 0.80 km over parts of MD-DE
Baltimore	M/R-D	Baltimore 4250 line km with spacing 4.80 km over parts of MD-PA-VA-WV

Estimates of undiscovered mineral resources

National Mineral Resource Assessment 1998: Estimates of the number of undiscovered mineral resources of gold, silver, copper, lead, and zinc within identified permissive tracts (geographic areas in which mineral deposits may form).

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Tract	Deposit Type	Mineralization age
SA20	Low-sulfide Au-quartz vein	Paleozoic

The continental crust

Seventy-seven major components of the North American continent were delineated at a general scale (1:5,000,000); including the general composition, geological environment, and types of primary metals endowments that can be expected in each domain.

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Domain	Crust type	Region
Piedmontia	Extensional accretionary orogen	Southeastern Laurentia and Appalachians

Asbestos mines, prospects, and occurrences in the US

Location and mineralogical characteristics of former mines, prospects, and occurrences of asbestos in the continental US. No asbestos producing mines are currently active. Data here are drawn from several previously published reports.

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Deposit name	Deposit type	Location
Conowingo Marble and Mineral Company serpentine quarry	occurrence

Mineral Resource Data System

MRDS describes metallic and nonmetallic mineral resources throughout the world. Included are deposit name, location, commodity, deposit description, geologic characteristics, production, reserves, resources, and references.

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Site name	Development	Commodities
Conowingo Marble and Mineral Quarry	Past Producer	FLD STN_C
Weiant Property	Past Producer	CR FLD STN
Caldwell Quarries	Past Producer	FLD

An index to PGE-Ni-Cr deposits and occurrences in selected mineral-occurrence databases (web-accessible database)

A compendium of references to previously published databases and database records that describe PGE, nickel, and chromium deposits and occurrences. These data show where to obtain more detailed information about each deposit or occurrence.

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Deposit name	Deposit type	Location
Line Pit Lowe\'s Mine	Past Producer	Maryland, United States
Line Pit Mine	Past Producer	Maryland, United States
Preston Farm Pits	Past Producer	Maryland, United States
Weiant Property	Past Producer	Maryland, United States
Stubbs Sand-Chrome Property	Occurrence	Maryland, United States
West Placer Area	Occurrence	Maryland, United States

National Geochronological Database

Radiometric ages of geological materials by K-Ar, Rb-Sr, Sm-Nd, fission track, and U-Th-Pb dating methods. A revision of DDS-14 correcting locations and providing the data in more convenient formats.

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Sample ID	Sample source	Rock name
5249	Outcrop or artificial surface exposure	Pegmatite

Global assessment of undiscovered copper resources

Deposits, prospects, and permissive tracts for porphyry and sediment-hosted copper resources worldwide, with estimates of undiscovered copper resources.

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Tract name	Deposit type	Geology
SA18 - Southern Appalachian Mountains	sediment-hosted stratabound copper	Triassic lacustrine carbonaceous mudstone intervals within sequences of continental sandstone and siltstones of the Newark Supergroup, Culpepper Basin

Prospect- and mine-related features on USGS topographic maps

Symbols indicating mining-related features digitized from historical USGS topographic maps in the western part of the conterminous US. Includes prospect pits, mine shafts and adits, quarries, open-pit mines, tailings piles and ponds, gravel and borrow pit

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Feature ID	Feature type	Feature name
Quarry	point